Method of forming wing nuts from sheet metal



May 28, 1957 Filed Aug. 28, 1951 G. PAVLINETZ 2,793,376

METHOD OF FORMING WING NUTS FROM SHEET METAL s Sheets-Sheet 1 May 28, 1957 e. PAVLINETZ METHOD OF FORMING WING NUTS FROM SHEET METAL Filed Aug. 28, 1951 s ShetS -Sheet 2 arias/v: Y

May 28, 1957 G. PAVLINETZ METHOD OF FORMING WING NUTS FROM SHEET METAL 3 Sheets-Sheet 3 Filed Ail //v vavroz 65026.6 PI vz/n/frz,

U WW United States Patent METHOD OF FORMING WING NUTS FROM SHEET METAL George Pavlinetz, Carteret, N. 12'.

Application August 28, 1951, Serial No. 244,063

7 Claims. (Cl. 10-86) This invention relates to winged fasteners produced from sheet metal stock and the method of producing them.

Whereas the production of Winged fasteners from sheet metal has been proposed over many years, none 'of the products of this type has possessed adequate strength to resist deformation forces to which they are commonly subjected, rendering it necessary to turn to the more expensive cast and forged varieties wherever any degree of strength is required.

It is among the objects of this invention to produce relatively simple, strong winged fasteners from sheet metal requiring no castings or forgings and avoiding drilling and welding operations as well as the use of expensive dies.

The method of making winged fasteners from sheet metal stock contemplated herein comprises forming a flat blank into a body having a tubular thread-carrying portion and a flaring Wing-forming portion diverging therefrom, pressing opposed wall surfaces of the wingforming portion into contact to produce Wings, and providing a screw thread for the thread-carrying portion. The sheet metal stock from which the fasteners are formed is preferably pressed or drawn to form a central tubular portion, following which the blank is stamped from the stock and opposed notches may be formed in its periphery. The portion extending from the tubular part thus formed is then flared, and by means of suitable dies, pressed substantially normally to the center line of the notches to form the wings and a terminal flange is produced in radially disposed relationship at the other end of the tubular portion of the body.

One end of the tubular body may be closed, which may be effected by continuing the wing formation across one end of the body. Spaced thread-carrying portions may be provided by the tubular body and internal threads may be formed in the body by radially pressing the tubular portion thereof. Where the winged fastener is to assume the form of a bolt, the pressing operation Will define a stop to limit the position of the bolt and will secure the end of the bolt in the body against relative rotation. This securing effect may be produced simultaneously with the formation of the Wings.

The sheet metal winged threaded fastener contemplated herein comprises a tubular body having opposed radial double-walled wings integral therewith, and a radial reinforcing flange formed at the other end of the body. The wings preferably project beyond one end of the tubular body and likewise extend for a substantial distance along its length. The tubular body may be closed at one end and in certain instances, the Wing structure itself serves to produce the closure. The tubular body may be internally threaded and its radial flange may be inwardly directed and likewise internally threaded. The radial flange may assume a reentrant form so that spaced threads may be provided to produce a locking action with respect to a member upon which such a winged nut is threaded.

A more complete understanding of the invention and its objects will follow from a detailed description of the accompanying drawings wherein:

Fig. 1 is an elevation of a winged nut embodying th present invention;

Fig. 2 is an end elevation of the nut shown in Fig. '1;

Fig. 3 is a plan view of the same nut;

Fig. 4 is a section taken along line 44 of Fig. 1;

Fig. 5 is a plan view of a partially formed blank from which the nut of Fig. l is produced;

Fig. 6 is an elevation of the right end of Fig. 5;

Fig. 7 is a front elevation of the blank of Fig. 5 after it has received a further forming operation;

Fig. 8 is an elevation partially in section depicting the operation of the dies during an intermediate step of the formation of the nut of Fig. 1;

Fig. 9 is an elevation partially in section depicting the operation of another pair of dies in the formation of the nut of Fig. 1;

Fig. 10 depicts a modified form of winged nut in elevation;

Fig. 11 is an end elevation of the nut of Fig. 10;

Fig. 12 is a plan view of the nut of Fig. 10;

Fig. 13 is a section taken along line 1313 of Fig. 10;

-Fig. 14 is an elevation of a partially formed blank employed in the production of the nut of Fig. 10;

Fig. 15 is a bottom plan view of the blank of Fig. 14;

Fig. 16 is an elevation of the blank of Fig. 14 after it has been subjected to a further forming operation;

Fig. 17 is an elevation partially in section of the same blank after it has been subjected to a subsequent operation;

Fig. 18 is an elevation partially in section depicting the operation of the dies in forming the partially completed blank of Fig. 17;

Fig. 19 depicts in a partially sectional elevation the operation of dies in a subsequent forming operation on the nut of Fig. 10;

Fig. 20 is an elevation of a modified form of winged nut;

Fig. 21 is an end elevation of the nut of Fig. 20;

Fig. 22 is an elevation of a winged bolt embodying certain aspects of the present invention;

Fig. 23 is a sectional elevation depicting an intermediate step in the production of the winged bolt of Fig. 22;

Fig. 24 is an elevation, partially in section, depicting the operation of the dies in producing the winged bolt of Fig. 22;

Fig. 25 is an elevation of a modified form of winged bolt;

Fig. 26 is a sectional elevation of an intermediate product produced in the formation of the winged bolt of Fig. 25; and

Fig. 27 is an elevation partially in section of the operation of the dies in producing the winged bolt of Fig. 25.

The blank 30 depicted in Fig. 5 is shown as containing a central opening 32 extending through a tubular sleeve 34 preferably formed by pressing or drawing prior to the removal of the blank 36) from the stock, not shown. The blank 30 is also provided with opposed notches 36 symmetrically disposed with respect to a diameter of the blank. After the blank has thus been formed with its sleeve 34 and notches 36, it is subjected to a pressing operation toproduce a flaring wall 38 of frusto-eonical die 40, shown in Fig. 8, and is in turn received between external dies 42 and 44 which collapse the flared wall 38 to define the. double-walled wings 46 extend-ingradi ally from a tubular portion 48 formed as a continuation:

of the sleeve 34.

A subsequent operation is performed, as depicted in Fig. 9 wherein an internal die 50 cooperates with external dies 52 and 54- to produce an out-turned radial flange 56 at the lower end of the tubular portion of the product, a lip 58 carried by the die 54 cooperating with an edge 60 of the die 52 to shear the upper edges of the wings to their desired shape. The opposed portions of the dies 52 and 54 bearing upon the wings 46 may be roughened to define indented surfaces 62 on the wings, and the internal die 50 may be threaded so that the internal threads 64 depicted in Fig. 4 will be formed simultaneously with the pressing operation, internally of the tubular portion 48.

It will be noted that the wings extend for a substantial distance longitudinally along the tubular portion 48 and project appreciably thereabove providing readily engageable portions for application and removal of the nut with respect to a threaded member. The radial flange 56 provides appreciable strength at one end of the tubular member resisting deformation forces that would tend to collapse the nut and shorten its life, the double-walled wings providing a substantial degree of strength at the other end of the product to resist undesired deformation.

In producing the modified form of winged nut depicted in Fig. 10, a blank is pressed or drawn to the form depicted in Fig. 14 having a lower tubular portion '70 closed by a bottom wall 72, the upper edge intersecting a substantially spherical wall '74 diverging or flaring towards an open end 76- containing opposed notches '78. By means of suitable dies, the lower tubular portion '70 is upset to produce a configuration similar to that depicted in Fig. 16 wherein an outwardly directed flange 8% and an inwardly directed flange 82 define what may be termed a reentrant flange, better shown in Fig. 17. The semi-finished article of Fig. 16 is subjected to a further pressing operation which penetrates the lower Wall '72 to form an opening 84 defined by ashort tubular wall 86 pressed upwardly from the inturned flange S2. The formation of this structure between internal dies 88 and 90 and external dies 92 and 94 has been depicted in Fig. 18. Following this operation, an internal die 96 is inserted in the partially completed product and the entire assembly subjected to the action of external dies 98 and 1% as shown in Fig. 19, it being understood that the internal die 96 may be provided with external threads so as to form the internal threads 3102 and 19 i internally of the tubular portions 106 and 8-6 of the product respectively, as shown in Fig, 13. The pressing operation as depicted in Fig. 19 collapses the upper flaring portion '74 of the body about the internal die 96 to form the upper tubular portion 196 and the double-walled Wings 198. The article produced as shown in Fig. 19 may be subg'ected to subsequent operations to trim excessive material or perform other functions, similar to the arrangement depicted in Pig. 9 with respect to the preceding form of the invention.

As depicted in Fig. 18, the upper internal die may be provided with a bore 119 to receive the lower internal dieSS together with such material as will be punched from the lower wall 72 when the lower internal die is forced upwardly into the upper one. 1

A modified form ofwinged nut is depicted in Figs. 20 and 21 wherein the upper end of the tubular portion 112 is closed by a wall 114 during the pressing operation. The reference characters of the modification shown in Fig. 1 f the drawings have been used as far as applicable to these figures as well. The method of producing this structure is somewhat similar to that employed in producing the structure of Fig. 1, the dies in the case of the form shown in Figs. 20 and 21 being designed to provide a I The winged bolt depicted in Fig. 22 is produced quite similarly to the nuts of Figs. 1 and 20. In this case, a bolt 118 has an upper end provided with serrations 120 to assure frictional engagement with the body of the winged fastener so that there will be no relative rotation. The lower end of the bolt 11% is provided with threads 122 projecting below the outwardly directed radial flange 56 of the body. The outwardly flared frustro-conical portion 38 as depicted in Fig. 23 is collapsed about the serrated upper end of the bolt 118 by means of suitable dies as depicted in Fig. 24-, comprising a table 124, a fix ture 126 receiving the threaded end of the bolt, and external dies 12? and 13 h which force the wall of the to bula-r portion 112 into binding relationship with the serrated portions of the bolt, simultaneously forming the double-walled wings 46.

In accordance with the modification depicted in Fig. 25, the upper end of the tubular portion 139 is closed by the winged structure 132 extending across it. The bolt 134 is shown as having a splined head 136 received in the tubular portion 134) of the body, and as shown in Fig. 26, above the tubular portion, the body flares outwardly in substantially frusto-conical shape having an inner wall 138 and an outer wall 14-11. In this condition, the partially completed article is arranged in a fixture 126 sup ported by a table 124, similar to those corresponding parts depicted in Fig. 24, whereupon external dies 142 and 144 are brought together to collapse the frusto-conical portion of the body to form the double-walled wing structure 132 and secure the tubular portion to the splined head 136 to prevent relative rotation of the parts. The product may be trimmed as provided in connection with previous examples, by means of suitable dies.

Whereas several modifications have been described for purposes of illustration, it will be recognized by those skilled in the art that the invention is applicable to many varieties of structures, and accordingly, the invention should not be limited to the examples selected beyond the scope of the appended claims.

I claim:

1. A method of making winged fasteners from sheet metal stock comprising forming a fiat blank into a body having a tubular substantially cylindrical portion and an said blank to define Wings before said forming operation.

3. A method as set forth in claim 1 including upsetting said tubular portion to define a terminal radial flange.

4. A method of making winged fasteners from sheet metal stock comprising forming a flat blank into a body having a tubular thread-carrying portion and an oppositely directed flaring tubular wing-forming portion'diverging therefrom, pressing opposed wall surfaces of said wing forming portion into contact to produce wings and a continuation of said tubular portion, providing a screw thread for said thread-carrying portion, and upsetting said tubular thread-carrying portion to produce a radiallyexl tending annular flange.

5. A method as set forth in claim 4 including jclosing an end of said tubular portion remote from said threadcarrying portion.

6. A method as set forth in claim 4 includingclosing an end of said tubular portion remote from said threadcarrying portion during saidpressing operation.

7. A method as set forth in claim 4 including internally threading said annular flange in spaced relationship to said tubular thread-carrying portion.

(References on following page) References Cited in the file of this patent UNITED STATES PATENTS Reed Feb. 13, 1906 Wilcox July 16, 1912 5 Eisler July 15, 1919 Colby Dec. 8, 1925 Booth June 21, 1927 Kellogg Aug. 19, 1930 Kaefer Sept. 15, 1931 10 Kimbell Nov. 20, 1934 6 Baynes Jan. 7, 1936 Bedford Mar. 23, 1943 Ballak Apr. 23, 1946 Aldeen Sept. 9, 1947 Lyndall Jan. 22, 1952 FOREIGN PATENTS Australia Apr. 17, 1947 Great Britain May 5, 1944 France Jan. 22, 1951 

